AX3522 Datasheet | AXElite

AX3522 1MHz, 3A Synchronous Step-Down Converter  GENERAL DESCRIPTION The AX3522 is a 1MHz constant frequency current mode PWM step-down converter. It is ideal for portable equipment requiring very high current up to 3A from single-cell Lithium-ion batteries while still achieving over 90% efficiency during peak load conditions. The AX3522 also can run at 100% duty cycle for low dropout operation, extending battery life in portable systems while light load operation provides very low output ripple for noise sensitive applications. The AX3522 can supply up to 3A output load current from a 2.8V to 5.5V input voltage and the output voltage can be regulated as low as 0.8V. The high switching frequency minimizes the size of external ponents while keeping switching losses low. The internal slope pensation setting allows the device to operate with smaller inductor values to optimize size and provide efficient operation. The AX3522 is available in adjustable (0.8V to VIN) output voltage. The device is available in SOP-8L-EP and TDFN-8L Pb-free packages.  Features 2.8V to 5.5V Input Voltage Range Output Voltages from 0.8V to VIN High Efficiency: Up to 94% 1MHz Constant Frequency Operation With power saving mode Up to 3A Output Current No Schottky Diode Required Current Mode Operation for Excellent Line and Load Transient Response Current limit and thermal shutdown protection Short Circuit Protect (SCP) Build-in Soft Start function SOP-8L-EP and TDFN-8 Pb-Free packages VÛm w`R - yÑb€ ww fo w.go tech .co m 1/12 AXElite Confidential Materials, do not copy or distribute without written consent . Rev.1.1 Oct.07, 2010  BLOCK DIAGRAM SLOPE P Isense AMP OSC SVIN REF PVIN + Soft-Star FB + + Ip RESET PWM LOGIC NON -OVERLAP CONTROL Izero SGND Over-Temperature and Short - Circuit Protection Enable Logic  PIN ASSIGNMENT The packages of AX3522 are SOP-8L-EP and TDFN-8L; the pin assignment is given by: Name Description SVIN Signal...